System and Method for Implementing an Automatic Discovery Function in a Dwdm Network

1. A system for implementing an automatic discovery function in a Dense Wavelength Division Multiplexing, DWDM, network, comprising: an optical supervisory channel, being a bi-directional physical channel, configured to transmit information through multiplexing/de-multiplexing a wavelength independent of a master optical channel with the master optical channel; a first Automatically Switched Optical Network, ASON, control unit, being located in a first node, configured to interact with a second ASON control unit in an adjacent second node through the optical supervisory channel so as to obtain the information of the second ASON control unit; and the second ASON control unit, being located in the second node, configured to interact with the first ASON control unit in the adjacent first node through the optical supervisory channel so as to obtain the information of the first ASON control unit, wherein an automatic discovery function of a physical transport link layer in the DWDM network is implemented through the transmission mechanism of the optical supervisory channel; and the automatic discovery functions of an optical transport section layer and an optical multiplex section layer in the DWDM network are implemented through the transmission mechanism of the optical supervisory channel; the system further comprising: a first optical supervisory device located in the first node and a second optical supervisory device located in the second node, wherein the first ASON control unit in the first node is configured to interact with the first optical supervisory device to transmit a request message to the adjacent second node through a designated optical supervisory channel; the second optical supervisory device is configured to supervise the request message received from the optical supervisory channel in real time, and forward the request message to the second ASON control unit in the second node; the second ASON control unit is configured to interact with the second optical supervisory device to transmit an Identifier, ID, reply message to the first node through the designated optical supervisory channel; the first optical supervisory device is configured to, after detecting the ID reply message in the designated optical supervisory channel, interact with the first ASON control unit to form a neighbor acknowledge request message, and transmit the neighbor acknowledge request message to the second node in the designated optical supervisory channel; and the second ASON control unit is configured to, after receiving the neighbor acknowledge request message through the optical supervisory channel, perform a judgment, form a neighbor acknowledge message according to the judged result, and transmit the neighbor acknowledge message to the first node through the designated optical supervisory channel.

2. The system according to claim 1 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device and a first optical pre-amplifier unit being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device and a second optical post-amplifier unit being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical post-amplifier unit via the second optical supervisory device; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical post-amplifier unit via the first optical supervisory device; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical post-amplifier unit through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical pre-amplifier unit to complete the receiving processing of the optical supervisory channel.

3. The system according to claim 1 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device, a first optical pre-amplifier unit, a first optical multiplexer and a first optical de-multiplexer being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device, a second optical post-amplifier unit, a second optical multiplexer and a second optical de-multiplexer being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical de-multiplexer; the second optical de-multiplexer is connected to the second optical multiplexer via the second optical supervisory device; and the second optical multiplexer is connected to the second optical post-amplifier unit; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical de-multiplexer; the first optical de-multiplexer is connected to the first optical multiplexer via the first optical supervisory device; and the first optical multiplexer is connected to the second optical post-amplifier unit; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical multiplexer through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical de-multiplexer to complete the receiving processing of the optical supervisory channel.

4. The system according to claim 2 , wherein the physical transport link comprises any of the following: an optical transport section, an optical multiplex section, and a TE link.

5. A method for implementing automatic discovery function in a Dense Wavelength Division Multiplexing, DWDM, network, comprising the following steps: step 1, a first Automatically Switched Optical Network, ASON, control unit in a first node interacting with a first optical supervisory device to transmit a request message to an adjacent second node through a designated optical supervisory channel; step 2, a second optical supervisory device in the second node supervising the request message received from the optical supervisory channel in real time, and forwarding the request message to a second ASON control unit in the second node; step 3, the second ASON control unit interacting with the second optical supervisory device to transmit an Identifier, ID, reply message to the first node through the designated optical supervisory channel; step 4, after detecting the ID reply message in the designated optical supervisory channel, the first optical supervisory device interacting with the first ASON control unit to form a neighbor acknowledge request message, and transmitting the neighbor acknowledge request message to the second node in the designated optical supervisory channel; and step 5, after receiving the neighbor acknowledge request message through the optical supervisory channel, the second ASON control unit performing a judgment, forming a neighbor acknowledge message according to the judged result, and transmitting the neighbor acknowledge message to the first node through the designated optical supervisory channel.

6. The method according to claim 5 , wherein step 1 comprises the following processing: the first ASON control unit notifying the first optical supervisory device of transmitting a neighbor request message for requesting an adjacent node ID and IP address through the designated optical supervisory channel via an inter-board communication mechanism; and after receiving the neighbor request message from the first ASON control unit, the first optical supervisory device transmitting the neighbor request message to the second node through the designated optical supervisory channel.

7. The method according to claim 6 , wherein step 3 comprises: the second ASON control unit requesting the second optical supervisory device to transmit an ID and IP address encapsulation message of the second node to the first node through the inter-board communication mechanism; and after receiving the request, the second optical supervisory device transmitting the ID reply message of the second node to the first node through the designated optical supervisory channel.

8. The method according to claim 7 , wherein step 4 comprises the following processing: after detecting the ID reply message on the designated optical supervisory channel, the first optical supervisory device forwarding the ID reply message to the first ASON control unit via an internal communication mechanism; after determining that the ID reply message is a message reply of a neighboring node, the first ASON control unit using the ID and IP address of the second node in the ID reply message and the ID and IP address of the first node to form a neighbor acknowledge request message, and requesting the first optical supervisory device to transmit the neighbor acknowledge request message to the second node; and the first optical supervisory device transmitting the neighbor acknowledge request message to the second node through the designated optical supervisory channel.

9. The method according to claim 8 , wherein step 5 comprises: after receiving the neighbor acknowledge request message via the optical supervisory channel, the second ASON control unit judging whether the ID and IP address of the second node in the neighbor acknowledge request message are identical to those of the local node; and if the judged result is that they are identical, the second ASON control unit using the ID and IP address of the first node to form a neighbor acknowledge message, and transmitting the neighbor acknowledge message to the first node through the designated optical supervisory channel.

10. The method according to claim 5 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device and a first optical pre-amplifier unit being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device and a second optical post-amplifier unit being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical post-amplifier unit via the second optical supervisory device; and the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical post-amplifier unit via the first optical supervisory device; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical post-amplifier unit through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical pre-amplifier unit to complete the receiving processing of the optical supervisory channel.

11. The method according to claim 5 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device, a first optical pre-amplifier unit, a first optical multiplexer and a first optical de-multiplexer being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device, a second optical post-amplifier unit, a second optical multiplexer and a second optical de-multiplexer being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical de-multiplexer; the second optical de-multiplexer is connected to the second optical multiplexer via the second optical supervisory device; and the second optical multiplexer is connected to the second optical post-amplifier unit; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical de-multiplexer; the first optical de-multiplexer is connected to the first optical multiplexer via the first optical supervisory device; and the first optical multiplexer is connected to the second optical post-amplifier unit; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical multiplexer through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical de-multiplexer to complete the receiving processing of the optical supervisory channel.

12. The method according to claim 10 , wherein the physical transport link comprises any of the following: an optical transport section, an optical multiplex section, and a TE link.

13. The system according to claim 3 , wherein the physical transport link comprises any of the following: an optical transport section, an optical multiplex section, and a TE link.

14. The method according to claim 6 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device and a first optical pre-amplifier unit being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device and a second optical post-amplifier unit being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical post-amplifier unit via the second optical supervisory device; and the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical post-amplifier unit via the first optical supervisory device; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical post-amplifier unit through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical pre-amplifier unit to complete the receiving processing of the optical supervisory channel.

15. The method according to claim 7 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device and a first optical pre-amplifier unit being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device and a second optical post-amplifier unit being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical post-amplifier unit via the second optical supervisory device; and the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical post-amplifier unit via the first optical supervisory device; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical post-amplifier unit through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical pre-amplifier unit to complete the receiving processing of the optical supervisory channel.

16. The method according to claim 8 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device and a first optical pre-amplifier unit being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device and a second optical post-amplifier unit being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical post-amplifier unit via the second optical supervisory device; and the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical post-amplifier unit via the first optical supervisory device; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical post-amplifier unit through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; and the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical pre-amplifier unit to complete the receiving processing of the optical supervisory channel.

17. The method according to claim 6 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device, a first optical pre-amplifier unit, a first optical multiplexer and a first optical de-multiplexer being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device, a second optical post-amplifier unit, a second optical multiplexer and a second optical de-multiplexer being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical de-multiplexer; the second optical de-multiplexer is connected to the second optical multiplexer via the second optical supervisory device; and the second optical multiplexer is connected to the second optical post-amplifier unit; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical de-multiplexer; the first optical de-multiplexer is connected to the first optical multiplexer via the first optical supervisory device; and the first optical multiplexer is connected to the second optical post-amplifier unit; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical multiplexer through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical de-multiplexer to complete the receiving processing of the optical supervisory channel.

18. The method according to claim 7 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device, a first optical pre-amplifier unit, a first optical multiplexer and a first optical de-multiplexer being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device, a second optical post-amplifier unit, a second optical multiplexer and a second optical de-multiplexer being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical de-multiplexer; the second optical de-multiplexer is connected to the second optical multiplexer via the second optical supervisory device; and the second optical multiplexer is connected to the second optical post-amplifier unit; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical de-multiplexer; the first optical de-multiplexer is connected to the first optical multiplexer via the first optical supervisory device; and the first optical multiplexer is connected to the second optical post-amplifier unit; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical multiplexer through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical de-multiplexer to complete the receiving processing of the optical supervisory channel.

19. The method according to claim 8 , wherein the optical supervisory channel comprises: a first optical post-amplifier unit, a first optical supervisory device, a first optical pre-amplifier unit, a first optical multiplexer and a first optical de-multiplexer being located in the first node, and a second optical pre-amplifier unit, a second optical supervisory device, a second optical post-amplifier unit, a second optical multiplexer and a second optical de-multiplexer being located in the second node, wherein the first optical post-amplifier unit is connected to the second optical pre-amplifier unit via a master optical channel; the second optical pre-amplifier unit is connected to the second optical de-multiplexer; the second optical de-multiplexer is connected to the second optical multiplexer via the second optical supervisory device; and the second optical multiplexer is connected to the second optical post-amplifier unit; the second optical post-amplifier unit is connected to the first optical pre-amplifier unit via the master optical channel; the first optical pre-amplifier unit is connected to the first optical de-multiplexer; the first optical de-multiplexer is connected to the first optical multiplexer via the first optical supervisory device; and the first optical multiplexer is connected to the second optical post-amplifier unit; and the first optical supervisory device multiplexes the information, which needs to be transmitted in the optical supervisory channel, with the master optical channel at the first optical multiplexer through a fixed wavelength and transmits it out via a physical transport link to complete the transmitting processing of the optical supervisory channel; the second optical supervisory device separates the signals transmitted by the optical supervisory channel from the master optical channel in the physical transport link through the second optical de-multiplexer to complete the receiving processing of the optical supervisory channel.

20. The method according to claim 11 , wherein the physical transport link comprises any of the following: an optical transport section, an optical multiplex section, and a TE link.